Finding the Fourth Proportional to 11,904.15, 17,857.10 and 3,139

Step by Step Solution

1. Step 1: Write the proportion equation
   11,904.15 : 17,857.10 = 3,139 : x
2. Step 2: Convert to fraction form
   11,904.15/17,857.10 = 3,139/x
3. Step 3: Cross multiply
   11,904.15x = 17,857.10 × 3,139
4. Step 4: Simplify right side
   11,904.15x = 56,053,436.90
5. Step 5: Solve for x
   x = 56,053,436.90/11,904.15
6. Step 6: Final answer
   x = 4,708.73